There are only a few options that one needs to know and enter. Here are those entries:

1) Source

The Source is either a folder or a URL. In our case, it is the URL for Cygwin. To determine that URL, please sojourn to http://www.sourceware.org/cygwin/mirrors.html. Per each URL, you have a choice http, ftp, or rsync. As we doing rysync, grap the URL for rsync.

Based on our proximity, we chose rsync://mirrors.kernel.org/sourceware/cygwin/release/